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Stockholders' Equity - Common Stock Repurchased (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Equity [Abstract] |  |  |  |
Common stock repurchased under repurchase program (in shares) | 5,989,279 | 0 | 11,424,755 | 0
Average purchase price per share (in usd per share) | $ 10.04 | $ 0 | $ 10.51 | $ 0
Shares repurchased related to employee stock-based compensation plans (in shares) | 24,036 | 200,577 | 1,313,427 | 2,940,595
Average purchase price per share (in usd per share) | $ 10.05 | $ 11.60 | $ 10.93 | $ 11.33
Common shares issued (in shares) | 181,020 | 384,955 | 3,651,684 | 5,944,946
Average purchase price per share under repurchase program | $ 80 |  | $ 80 |

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